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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4207356af78dc4e93aa9eecf1bc969c0cc05555d03f78698d04d29fb461f5bf1' 
  AND token = 'Iv2ad2DMHDJkwlp/ujLKUNVqfzzD7DDQqb460t0SV3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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