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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb846ef0661962998f59114b4263ab81a9bb22a23e577cf22e91fb8f20ecd5aa' 
  AND token = '+kKm4c27dBU3tKirCSeH4U3JDD1gXvUXw3fkSNGZiW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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