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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '283d0014004bb5b5f9c2a41fe83c5846ea267d1104749554efff2accc50ddfad' 
  AND token = 'vOmEHCobKnwF1mrfLY61lauF3JAfp0xU++r6kCfC9nY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00102

JSON explain

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