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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9da20053752afc6b8800c1140f9e0bfac24fe40d3e720cc4ad04c91048270803' 
  AND token = 'mocupd14KEfhfjsXJmR/dByGnTnQ1i7Bnjm+8fPe+9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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