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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a52e3345ac7c07076b277245429820008ac422b2a0e9014585f13961234f451' 
  AND token = 'G/F/VTFnD/LaNe5Ulapv2us88bGTSkZ/gNSjwnUkXsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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