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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5247c641d03ddcb8dba387febde7a0b1a95d569798a7f8c800bd7d843d70e62' 
  AND token = 'i7krNJKJvnL34UNQoDaSil9twFDIrEIlb+6bKVsR3zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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