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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e63f814a40a2c1c702eb908761039cafd5a5cf4a3f207341071698df984a0cd2' 
  AND token = 'rrrSLDBh4rNMxYfSHmjG5qKrCMz4kGvLH2fwhAq7tyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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