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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f38ee79566c089e3ee97e798e4c8cbc69eb6cbf1c1381a1ba7662ebfee716e04' 
  AND token = 'jnEaeEXsz84cIggRNVooXA5TZp6uGvWj463zx3lZLmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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