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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e59c173bdba4d0f64a8b3663f360ad1159179c2541228aebefc364a6a44c46ec' 
  AND token = 'yrE7sYSF62Bh0//6PcMrQ1kJ2kuYlEktJ8GnHzW1MG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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