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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4e9db2373bb06d1c833700e8653dda8485ca05a6e915a75604bcbcc3de3210d' 
  AND token = 'pNOL9XsR7E86HQksKR2O7Pvp5TXIiMNE2IzR3UIwDHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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