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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c7db0562cd5c2286c27c538d4218c34fd136da06bd3dc7a15e0c3d6332fe043' 
  AND token = 'F5yJaOgR7pmcnYB6uuTG82MCyEAFitPJ67iabRs6K/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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