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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6f00dcb6149ecacb7efb217c9b9724af44428fc198eece699d2d5feaf1aae9a' 
  AND token = '1R8o9782lsE3flUzcP/FWp8DO+gDWr5GttJT4Su+K28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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