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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9eb9342243abd61d46ea63c48c10e671a92f5b2c74aa2462970c80379cc156b' 
  AND token = 'BXp4VPueuPA/s1SRSIokgw1rKm5jg+oF236ybgs8yVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

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