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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b89c827304b4898b31228312a914191a059ba43bc890563e5ad72465e7dde29' 
  AND token = 'WigtIuFSNJ2Jlw2aKEHCGAGZLHeHDeBQ/7If/7lxPJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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