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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baf3d701fa4259d493cca3e0b0c364d0c287f4a3fec9ecbc310a57ec0e24fd1a' 
  AND token = 'mcTF8WU8ndRGc3fIwa8mL2ye1DjlKjNBTjQCr0A14VA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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