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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'babce673613d43ef4a53d48988b803c2fcb213afce83a1ae61a0c2e082f8a7f8' 
  AND token = 'EXsaWArXGvKtinuCkcKtnz/v6pOGgJnUL1URaPB4IXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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