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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3a67f3b33ed87569d46317b212758f3808b2bc0ed239517b0944a6e768e00f7' 
  AND token = 'fMwRBIbLDethRKw1CFbgKQb0hyZqyxREdvdnPOS2cdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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