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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb931832cd2a92236ca135e1cf25b111053a22d01b947e962bbe782e0e5fcfa2' 
  AND token = '3hhkv8SwxAL5TZJN77kahdzlt4gMUP77Nw3uvQ5h3Tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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