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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b93a39173e2259a605addb7cf6d9690bcde3e2c735bb92801a12b26d87ed13d6' 
  AND token = 'LHRudfC/LyqunfCt8ZEmVZTpRa5XLMBforRZpfDnlYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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