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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '366320c2641f207ecf7294e024c1ea7262ea95c5a1f9d8ba75d170a63bf4ad7b' 
  AND token = 'kBLCKoowPbBKnnvcn1o+ZmB3Pmy+uTK8aUadk6kGdEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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