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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3431449b0354620d68f06109c7540c2f68663f6402d1e7066f342d8914d6224e' 
  AND token = 'i/BaKL+nL9s2ysfIsC5wgH5ow2k717AvgRz1qEENUP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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