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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93a398371539a2280f75f1066e663c28ff2a9ae15ccd47b8f47404a0bbb5f0de' 
  AND token = 'caL5WwHWP+I7fbQV9aQ+0Cpzamof3M6XPBQLG3ziL8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}