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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '980678962b535c37d158f98f4b37adea59b0126239fc72373f1fdc5ac72d66be' 
  AND token = 'J1E8cPTL1vmYrHOpX3PCxef9euwRHpIky1CVQCun2to=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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