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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e342e07cd14b27af1e4306a9bae1fa434f7353be5d4213d4d4b4974f5f044704' 
  AND token = '/OwahcGbtmU67nm2ij+dch8ud3a1A2hTh7mVGchziJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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