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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3005cc2041147ccd94397ad4736d321c50c1000d914345c510a09078e4b03a2' 
  AND token = 'aK+z3Gx7VfGkKAMbC5N2DvDaOhCrP3Q1jvpZ3y2E0GA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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