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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4145a502cf509acbbd4952def1785ddf2903f90794c12819fee5badb488b9f7c' 
  AND token = '+t0cgdZ/luIPVoZGd1cY14Q2nzh1mU8R1zKZxx1akYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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