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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07d8feb312b59a7ee96595a50ac1895146b0eb3f001e62da7db4a0782c503b1e' 
  AND token = 'S5cQucNv+EygUrBou8UN3KpqKIqRa+Uhm7q07YCs1+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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