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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85c9745a1c49121963597d28689e5200f295e93dd41211222db843b3fec63489' 
  AND token = '5pMBgtQkAr7kXf2bKZ9hX3OOcmGAVmE3K7UyeykCe6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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