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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e6386610a683db77493ab463e5249cdaae3e08d2836acbe3aebba6d1351a476' 
  AND token = '4Aj+WaDygCTKuUV1jmxl314pJ2zx3a6LgaiNyqzp3M4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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