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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '597740eddf7aebfdfb3637399624d654f52c4eb182ea0b0fc74dd4fd51727f5b' 
  AND token = 'GhMzukwoxEa9QVWg9vnffcruwaXI9idbMZ6F+EkH44A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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