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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69428955a5679c60f3adc2c58762e1b8cda23bdd10f2dbde44f6514e7ec8f5ef' 
  AND token = 'C3iB+MoBti0boM21q9JT0yRtOWmnqAKHzkQoIviVV+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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