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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd35fc3aa4066fa97fd8d09381b9c269c4a78f40cf2a9e86e1010c3252c9664f1' 
  AND token = 'wAyomBfTBI9Ak/ylS1PkgCqwbmm/NP6TTi2p/roxY6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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