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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '697ea95119c05c26c2e23a1822da76faa7f9da4e95966d77e20ef2ecfd2f9639' 
  AND token = 'x5oRT7QaEIGgM/fP38uF206BDUbGDI3LG+vB7cGlQ1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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