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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee913ffb1ec9f9f633fe22af2db7fe4c5c63b4589e0e2f5c14d415facbbb420a' 
  AND token = 'Eg4SM6s1iAKGcBmg2A/YyDCrdS5whW5bZFSRwrtK1TY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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