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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa08f370fa12cb05e3a49e2103feea57ffee026d6153885b9afd57d9d86b628b' 
  AND token = 'OSVF076qknbEM4oxF6Ai0k0v0Pxy+490AOAEPr4F7Fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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