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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a4a2ff3f1755135c224e9d2f0a1859d27de51809eaa0f6ed09bf16110f076d0' 
  AND token = '1pr0tcEcOvCXvgzx/FfyqGi94e1+O+9kHEBZS1meCRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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