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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eed62e6ec8d9d0308992481076f47af5b8714f2a5383bb636c02f2a21275938c' 
  AND token = '37r3NQmdLXS+3YkaEP4777PE5cSCdJJwrZ1v6NkFCqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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