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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b6551071600c10a9a5d99b2b32dbb756cbd7ad129b609097698c723567b2654' 
  AND token = '4SVpBMh280h84V0FhnefdIcAD75BubrUVo93iffEXm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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