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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4d64b87868f470cc92fd2712e8d4838f50b2c8ffc9ea3d329a5edfa94e4dcdf' 
  AND token = '7bv+nVL8UZjgiPr+epSSdOpLS6UcEzLWdWwmY3N9z9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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