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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98db9305a937cf97cb70214f5a587510d0e0c063241b92e77f5859c04709d9fd' 
  AND token = 'Cp8u4Oj4xGYCAekdJUwyJ586JSwYcziZWTEVKo1zQr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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