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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0525c66ccdadb24fa88ab44b1b3d3fa5bc488f30d9abb5bf388bccaef25f0588' 
  AND token = 'T4KCRZU7IK1o4bNN5ktJrhYqC3ok/UaK63wB7Sk3ec0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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