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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '052a7862a0d97305e02ebcdecf7865df7c4b33f62e0567e2e55f3823b1fe2eed' 
  AND token = '6HVfM7rf00/nlvc4L+nTo9EL/4LAdpspjQeS4/sOKZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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