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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3fe1c5fa95e30925847ac0b1eba06115c6ac6ab7f029f8e8c844c07251918e9' 
  AND token = 'EFzt5nmZ/c4/p2jGuAjxsoiNn1lAOtewXk8BCqa5dVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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