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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9ce4ac1da2f3a0bb0029b4bb9cc3231b6579d97e0143067f34672d8360d4051' 
  AND token = 'lmZSIANohUsda+sSLwl+M62sW2lMeQuMiuutp5yhDSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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