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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ad0f6ec70b3a18a47e7e715b088f6ea75177a0d372f762076d4b0a9e0e8cd2c' 
  AND token = 'At+ybzPTtECS8ndbTLsAM525JkD91prQyVeaTbpbPl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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