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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cecaa21d51e46398d8cd64096605fb673e53e1354c4b093a2730fd3ce9912ee7' 
  AND token = '9MYQgAnrUzTjy6oNdK2Jlrg5IkMPsB+T4VA7QFqfc/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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